LYN

Last updated
LYN
PDB 1wa7 EBI.png
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases LYN , LYN proto-oncogene, Src family tyrosine kinase, JTK8, p53Lyn, p56Lyn
External IDs OMIM: 165120 MGI: 96892 HomoloGene: 55649 GeneCards: LYN
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_001111097
NM_002350

NM_001111096
NM_010747

RefSeq (protein)

NP_001104567
NP_002341

NP_001104566
NP_034877

Location (UCSC) Chr 8: 55.88 – 56.01 Mb Chr 4: 3.68 – 3.81 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

Tyrosine-protein kinase Lyn is a protein that in humans is encoded by the LYN gene. [5]

Contents

Lyn is a member of the Src family of protein tyrosine kinases, which is mainly expressed in hematopoietic cells, [6] in neural tissues [7] liver, and adipose tissue. [8] In various hematopoietic cells, Lyn has emerged as a key enzyme involved in the regulation of cell activation. In these cells, a small amount of LYN is associated with cell surface receptor proteins, including the B cell antigen receptor (BCR), [9] [10] CD40, [11] or CD19. [12] The abbreviation Lyn is derived from Lck/Yes novel tyrosine kinase, Lck and Yes also being members of the Src kinase family.

Function

Lyn has been described to have an inhibitory role in myeloid lineage proliferation. [13] Following engagement of the B cell receptors, Lyn undergoes rapid phosphorylation and activation. LYN activation triggers a cascade of signaling events mediated by Lyn phosphorylation of tyrosine residues within the immunoreceptor tyrosine-based activation motifs (ITAM) of the receptor proteins, and subsequent recruitment and activation of other kinases including Syk, phosholipase Cγ2 (PLCγ2) and phosphatidyl inositol-3 kinase. [12] [14] These kinases provide activation signals, which play critical roles in proliferation, Ca2+ mobilization and cell differentiation. Lyn plays an essential role in the transmission of inhibitory signals through phosphorylation of tyrosine residues within the immunoreceptor tyrosine-based inhibitory motifs (ITIM) in regulatory proteins such as CD22, PIR-B and FCγRIIb1. Their ITIM phosphorylation subsequently leads to recruitment and activation of phosphatases such as SHIP-1 and SHP-1, [15] [16] [17] [18] [19] which further downmodulate signaling pathways, attenuate cell activation and can mediate tolerance. In B cells, Lyn sets the threshold of cell signaling and maintains the balance between activation and inhibition. Lyn thus functions as a rheostat that modulates signaling rather than as a binary on-off switch. [20] [21] [22] HSP90 inhibitor NVP-BEP800 has been described to affect stability of LYN kinase and growth of B-cell acute lymphoblastic leukemias through inhibition of the NF-kappaB signaling. [23]

LYN is reported to be a key signal mediator for estrogen-dependent suppression of human osteoclast differentiation, survival, and function. [24] Lyn has also been implicated to have a role in the insulin signaling pathway. Activated Lyn phosphorylates insulin receptor substrate 1 (IRS1). This phosphorylation of IRS1 leads to an increase in translocation of Glut-4 to the cell membrane and increased glucose utilization. [25] In turn, activation of the insulin receptor has been shown to increase autophosphorylation of Lyn suggesting a possible feedback loop. [26] The insulin secretagogue, glimepiride (Amaryl®) activates Lyn in adipocytes via the disruption of lipid rafts. [27] This indirect Lyn activation may modulate the extrapancreatic glycemic control activity of glimepiride. [27] [28] Tolimidone (MLR-1023) is a small molecule allosteric activator of lyn kinase with an EC50 of 63 nM [29] [30] that is currently under Phase 2a investigation for Type II diabetes. [31] In June, 2016, the sponsor of these studies, Melior Discovery, announced positive results from their Phase 2a study with tolimidone in diabetic patients, [32] [33] and the continuation of additional clinical studies. [34]

Lyn has been shown to protect against hepatocellular apoptosis and promote liver regeneration through the preservation of hepatocellular mitochondrial integrity. [35]

Several investigators have shown the role of lyn kinase in different aspects of pulmonary function. Lyn activation in pulmonary epithelium has been shown to be important in improving pulmonary barrier integrity and to reduce edema. [36] [37] Additional evidence suggest that lyn activation in alveolar phagocytes improves phagocytosis of bacteria and reduces pulmonary infection. [38] [39] Finally, other research has found that lyn activation reduces pulmonary hypersecretion of mucus. [40]


Pathology

Much of the current knowledge about Lyn has emerged from studies of genetically manipulated mice. Lyn deficient mice display a phenotype that includes splenomegaly, a dramatic increase in numbers of myeloid progenitors and monocyte/macrophage tumors. Biochemical analysis of cells from these mutants revealed that Lyn is essential in establishing ITIM-dependent inhibitory signaling and for activation of specific protein tyrosine phosphatases within myeloid cells. [13]

Mice that expressed a hyperactive Lyn allele were tumor free and displayed no propensity toward hematological malignancy. These mice have reduced numbers of conventional B lymphocytes, down-regulated surface immunoglobulin M and costimulatory molecules, and elevated numbers of B1a B cells. With age these animals developed a glomerulonephritis phenotype associated with a 30% reduction in life expectancy. [41]

Interactions

LYN has been shown to interact with:

See also

Related Research Articles

<span class="mw-page-title-main">Lck</span> Lymphocyte protein

Lck is a 56 kDa protein that is found inside specialized cells of the immune system called lymphocytes. The Lck is a member of Src kinase family (SFK) and is important for the activation of T-cell receptor (TCR) signaling in both naive T cells and effector T cells. The role of Lck is less prominent in the activation or in the maintenance of memory CD8 T cells in comparison to CD4 T cells. In addition, the constitutive activity of the mouse Lck homolog varies among memory T cell subsets. It seems that in mice, in the effector memory T cell (TEM) population, more than 50% of Lck is present in a constitutively active conformation, whereas less than 20% of Lck is present as active form in central memory T cells. These differences are due to differential regulation by SH2 domain–containing phosphatase-1 (Shp-1) and C-terminal Src kinase.

<span class="mw-page-title-main">Receptor tyrosine kinase</span> Class of enzymes

Receptor tyrosine kinases (RTKs) are the high-affinity cell surface receptors for many polypeptide growth factors, cytokines, and hormones. Of the 90 unique tyrosine kinase genes identified in the human genome, 58 encode receptor tyrosine kinase proteins. Receptor tyrosine kinases have been shown not only to be key regulators of normal cellular processes but also to have a critical role in the development and progression of many types of cancer. Mutations in receptor tyrosine kinases lead to activation of a series of signalling cascades which have numerous effects on protein expression. The receptors are generally activated by dimerization and substrate presentation. Receptor tyrosine kinases are part of the larger family of protein tyrosine kinases, encompassing the receptor tyrosine kinase proteins which contain a transmembrane domain, as well as the non-receptor tyrosine kinases which do not possess transmembrane domains.

<span class="mw-page-title-main">GRB2</span> Protein-coding gene in the species Homo sapiens

Growth factor receptor-bound protein 2, also known as Grb2, is an adaptor protein involved in signal transduction/cell communication. In humans, the GRB2 protein is encoded by the GRB2 gene.

<span class="mw-page-title-main">ZAP70</span> Protein-coding gene in the species Homo sapiens

ZAP-70 is a protein normally expressed near the surface membrane of lymphocytes. It is most prominently known to be recruited upon antigen binding to the T cell receptor (TCR), and it plays a critical role in T cell signaling.

<span class="mw-page-title-main">Tyrosine-protein kinase SYK</span>

Tyrosine-protein kinase SYK, also known as spleen tyrosine kinase, is an enzyme which in humans is encoded by the SYK gene.

<span class="mw-page-title-main">CD22</span> Lectin molecule

CD22, or cluster of differentiation-22, is a molecule belonging to the SIGLEC family of lectins. It is found on the surface of mature B cells and to a lesser extent on some immature B cells. Generally speaking, CD22 is a regulatory molecule that prevents the overactivation of the immune system and the development of autoimmune diseases.

<span class="mw-page-title-main">Lymphocyte cytosolic protein 2</span> Protein-coding gene in the species Homo sapiens

Lymphocyte cytosolic protein 2, also known as LCP2 or SLP-76, is a signal-transducing adaptor protein expressed in T cells and myeloid cells and is important in the signaling of T-cell receptors (TCRs). As an adaptor protein, SLP-76 does not have catalytic functions, primarily binding other signaling proteins to form larger signaling complexes. It is a key component of the signaling pathways of receptors with immunoreceptor tyrosine-based activation motifs (ITAMs) such as T-cell receptors, its precursors, and receptors for the Fc regions of certain antibodies. SLP-76 is expressed in T-cells and related lymphocytes like natural killer cells.

<span class="mw-page-title-main">Linker for activation of T cells</span> Protein-coding gene in the species Homo sapiens

The Linker for activation of T cells, also known as linker of activated T cells or LAT, is a protein involved in the T-cell antigen receptor signal transduction pathway which in humans is encoded by the LAT gene. Alternative splicing results in multiple transcript variants encoding different isoforms.

<span class="mw-page-title-main">Janus kinase 2</span> Non-receptor tyrosine kinase and coding gene in humans

Janus kinase 2 is a non-receptor tyrosine kinase. It is a member of the Janus kinase family and has been implicated in signaling by members of the type II cytokine receptor family, the GM-CSF receptor family, the gp130 receptor family, and the single chain receptors.

<span class="mw-page-title-main">FYN</span> Mammalian protein found in Homo sapiens

Proto-oncogene tyrosine-protein kinase Fyn is an enzyme that in humans is encoded by the FYN gene.

<span class="mw-page-title-main">PRKCD</span> Protein-coding gene in the species Homo sapiens

Protein kinase C delta type is an enzyme that in humans is encoded by the PRKCD gene.

<span class="mw-page-title-main">PIK3R1</span> Protein-coding gene in the species Homo sapiens

Phosphatidylinositol 3-kinase regulatory subunit alpha is an enzyme that in humans is encoded by the PIK3R1 gene.

<span class="mw-page-title-main">PTPN6</span> Protein-coding gene in humans

Tyrosine-protein phosphatase non-receptor type 6, also known as Src homology region 2 domain-containing phosphatase-1 (SHP-1), is an enzyme that in humans is encoded by the PTPN6 gene.

<span class="mw-page-title-main">PLCG1</span> Protein-coding gene in the species Homo sapiens

Phospholipase C, gamma 1, also known as PLCG1 and PLCgamma1, is a protein that in humans involved in cell growth, migration, apoptosis, and proliferation. It is encoded by the PLCG1 gene and is part of the PLC superfamily.

<span class="mw-page-title-main">CRKL</span> Protein-coding gene in the species Homo sapiens

Crk-like protein is a protein that in humans is encoded by the CRKL gene.

<span class="mw-page-title-main">DOK1</span> Protein-coding gene in the species Homo sapiens

Docking protein 1 is a protein that in humans is encoded by the DOK1 gene.

<span class="mw-page-title-main">PTK2B</span> Protein-coding gene in the species Homo sapiens

Protein tyrosine kinase 2 beta is an enzyme that in humans is encoded by the PTK2B gene.

<span class="mw-page-title-main">INPP5D</span> Protein-coding gene in the species Homo sapiens

Src homology 2 (SH2) domain containing inositol polyphosphate 5-phosphatase 1(SHIP1) is an enzyme with phosphatase activity. SHIP1 is structured by multiple domain and is encoded by the INPP5D gene in humans. SHIP1 is expressed predominantly by hematopoietic cells but also, for example, by osteoblasts and endothelial cells. This phosphatase is important for the regulation of cellular activation. Not only catalytic but also adaptor activities of this protein are involved in this process. Its movement from the cytosol to the cytoplasmic membrane, where predominantly performs its function, is mediated by tyrosine phosphorylation of the intracellular chains of cell surface receptors that SHIP1 binds. Insufficient regulation of SHIP1 leads to different pathologies.

<span class="mw-page-title-main">B-cell linker</span> Mammalian protein found in Homo sapiens

B-cell linker (BLNK) protein is expressed in B cells and macrophages and plays a large role in B cell receptor signaling. Like all adaptor proteins, BLNK has no known intrinsic enzymatic activity. Its function is to temporally and spatially coordinate and regulate downstream signaling effectors in B cell receptor (BCR) signaling, which is important in B cell development. Binding of these downstream effectors is dependent on BLNK phosphorylation. BLNK is encoded by the BLNK gene and is also known as SLP-65, BASH, and BCA.

<span class="mw-page-title-main">Tyrosine-protein kinase CSK</span> Kinase enzyme that phosphorylates Src-family kinases

Tyrosine-protein kinase CSK also known as C-terminal Src kinase is an enzyme that, in humans, is encoded by the CSK gene. This enzyme phosphorylates tyrosine residues located in the C-terminal end of Src-family kinases (SFKs) including SRC, HCK, FYN, LCK, LYN and YES1.

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Further reading